It depends on what your goals are. Are you going for mass, strength, athleticism, etc.. A few years ago, before the fire academy, I weighed 140 lbs and was weak as shit. I lifted heavy (with low reps) and ate like a horse and am currently up to 185lbs.
I actually just started crossfit with some buddies from work and I feel so out of shape. It's a whole different ball game.
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